Add a value for end-to-end reloads in Cache policy

Source/platform/network/ResourceRequest.h

Index: Source/platform/network/ResourceRequest.h
diff --git a/Source/platform/network/ResourceRequest.h b/Source/platform/network/ResourceRequest.h
index 0cb3a1d21363e5dc24598e7e0b464493dddd04e7..6a819f3bbbe1d64131f27c4d674aa7f205eab42b 100644
--- a/Source/platform/network/ResourceRequest.h
+++ b/Source/platform/network/ResourceRequest.h
@@ -42,7 +42,8 @@ enum ResourceRequestCachePolicy {
     UseProtocolCachePolicy, // normal load
     ReloadIgnoringCacheData, // reload
     ReturnCacheDataElseLoad, // back/forward or encoding change - allow stale data
-    ReturnCacheDataDontLoad  // results of a post - allow stale data and only use cache
+    ReturnCacheDataDontLoad, // results of a post - allow stale data and only use cache
+    ReloadBypassingCache, // end-to-end reload
 };
 
 struct CrossThreadResourceRequestData;